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lib: sbi: add Ssdbltrp ISA extension support

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Add Ssdbltrp trap handler support for S-mode double trap handling. If
the trap is received while in VS-mode, then the trap is redirected to
S-mode. If caught while in HS-mode, then an error is returned to the top
trap handler which will panic.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
This commit is contained in:
Clément Léger
2024-10-18 10:40:04 +02:00
committed by Anup Patel
parent 80656bdb1d
commit 9c78593269
7 changed files with 46 additions and 1 deletions
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4
lib/sbi/sbi_trap.c
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@@ -350,6 +350,10 @@ struct sbi_trap_context *sbi_trap_handler(struct sbi_trap_context *tcntx)
rc = sbi_store_access_handler(tcntx);
msg = "store fault handler failed";
break;
case CAUSE_DOUBLE_TRAP:
rc = sbi_double_trap_handler(tcntx);
msg = "double trap handler failed";
break;
default:
/* If the trap came from S or U mode, redirect it there */
msg = "trap redirect failed";